But the movements which are thus excited
in the brain by the nerves variously affect the soul or mind, which
is intimately conjoined with the brain, according to the diversity
of the motions themselves. And the diverse affections of the mind or
thoughts that immediately arise from these motions, are called
perceptions of the senses (SENSUUM PERCEPTIONES), or, as we commonly
speak, sensations (SENSUS).
CXC. Of the distinction of the senses; and, first, of the internal,
that is, of the affections of the mind (passions), and the natural
appetites.
The varieties of these sensations depend, firstly, on the diversity
of the nerves themselves, and, secondly, of the movements that are
made in each nerve. We have not, however, as many different senses
as there are nerves. We can distinguish but seven principal classes
of nerves, of which two belong to the internal, and the other five
to the external senses. The nerves which extend to the stomach, the
oesophagus, the fauces, and the other internal parts that are
subservient to our natural wants, constitute one of our internal
senses. This is called the natural appetite (APPETITUS NATURALIS).
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